datapump directory unc path

Hello,

I have a new single instance Oracle 12c environment running on a new Windows 2012 server.  I want to use impdp and expdp with a destination for the .dmp file on a different windows servers.  I have created and granted r/w privileges on a new directory (oscar_dp) to public.  The directory is defined with a unc path, eg \\oscar\databases.  It has r/w privileges granted to everyone on that server and I can see it from the Windows 2012 server.

I cannot get these to work versions of impdp to work.

1) impdp schemaowner/schemaowner@orcl dumpfile=oscar_dp:rytynan.DMP ...